Brief [an Adolf Dyroff]
Bonn, 03.11.1927 [3.11.1927]Brief an Geheimrat Prof. Dr. Stoerring, Bonn
Orono, Me., 01.07.1929 [1. Juli 1929]Bisher veröffentlichte Untersuchungen.
In: Brief an Geheimrat Prof. Dr. Stoerring, BonnOrono, Me., 1929 [[ohne Datum, 1929]]Brief an Kollege [Adolf Dyroff]
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Straßburg, 01.11.1913 [1/XI [19]13]Brief an Kollege [Adolf Dyroff]
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Straßburg, 04.12.1913 [4/XII [19]13]Brief an Kollege [Adolf Dyroff]
Straßburg, 06.01.1914 [6/I [19]14]Brief an Kollege [Adolf Dyroff]
Straßburg, 15.01.1914 [15/I [19]14]Brief an Kollege [Adolf Dyroff]
Zürich, 01.01.1929 [1/I [19]29]Brief an Kollege [Adolf Dyroff]
Bonn, 27.02.1928 [27/II [19]28]Brief an Kollege [Adolf Dyroff]
Basel, 25.12.1928 [25/XII [19]28]Brief an Kollege [Adolf Dyroff]
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Lugano, 08.12.1929 [8/XII [19]29]Brief an Professor Dr. Dyroff, Bonn, Richard Wagnerstr. 7
Bonn, 11.11.1913 [11. November 1913]Brief an Professor Dr. Dyroff, Bonn, Richard Wagnerstr. 7
Bonn, 12.11.1913 [12. November 1913]